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Experimental study of air-side performance of a flat fin-and-tube heat exchanger under dry and wet conditions.

Number: 2477

Author(s) : KILIC O., YORUK B.

Summary

In this study, experiments were conducted on a fin-and-tube heat exchanger under both wet and dry conditions. Throughout the experiments, the air inlet temperature to the heat exchanger remained constant. Tests were carried
out at relative humidities of 30%, 70%, 80%, and 90% for both dry and wet conditions. Additionally, experiments were conducted at five different air velocities for each relative humidity. Since the same heat exchanger was used for all test conditions, the geometric parameters of the heat exchanger remained unchanged during the experiments. The aim of this study is to investigate the performance of a finned-tube heat exchanger under different tube arrangements in both dry and wet conditions, a topic that has not been extensively covered in the literature. The experimental data were analyzed theoretically, first comparing the heat transfer coefficient and then the Colburn jfactor. These analyses were compared with some commonly used correlations in the literature. Based on the results obtained from the experiments, a comparison was made regarding the air-side performance of the fin-and-tube heat exchanger. The pressure drop values on the air side under wet conditions showed similar results at the same Reynolds number, despite varying relative humidities. There was a difference of 3% to 10% in the Reynolds number under wet conditions. When comparing the pressure drop values on the air-side between dry and wet conditions at the same Reynolds number, there was an average difference of 71%. The Colburn j-factor and heat transfer coefficient results are consistent with each other. The heat transfer coefficient values under dry and wet conditions were approximately 2.5 times higher at low relative humidities, increasing up to 3.1 times at 90% relative humidity.

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  • Original title: Experimental study of air-side performance of a flat fin-and-tube heat exchanger under dry and wet conditions.
  • Record ID : 30033054
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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